What does @? Mean in Oracle?
It refers to a non-local table, the bit behind the @ is the db descriptor. select * from question_answer@abcd where id = ’45’ Means select not from the local question_answer table, but from the table on the db designated as abcd .
What does => mean in Plsql?
That is the keyword/value notation for passing parameters to a PL/SQL procedure or function. The left side is the name of the parameter, the right is the value being passed. It’s useful when you don’t want to keep to a specific ordering of parameters, or for self-documenting code.
What is the meaning of <> in Oracle?
It means ‘not equal to‘.
Which symbol is used for comparison in PL SQL *?
Can a person be an oracle?
The definition of an oracle is a person with great wisdom or someone believed to have communication with a deity. An example of an oracle is someone who has conversations with God. … A person such as a priest through whom the deity is supposed to respond with prophecy or advice.
Where do we declare PL SQL?
You must declare the PL/SQL variable in the declaration section or in a package as a global variable. After the declaration, PL/SQL allocates memory for the variable’s value and the storage location is identified by the variable name.
Why we use PL SQL?
PL/SQL allows sending an entire block of statements to the database at one time. This reduces network traffic and provides high performance for the applications. PL/SQL gives high productivity to programmers as it can query, transform, and update data in a database.
Can we commit inside a trigger?
Any change that a trigger does is committed with the transaction that fired the trigger. So yes, the change done inside the trigger will be committed “automatically”. You can’t commit inside a trigger anyway.
What is the use of in Oracle?
The Oracle IN condition is used to help reduce the need to use multiple OR conditions in a SELECT, INSERT, UPDATE, or DELETE statement.
What is the use of & in PL SQL?
& has no meaning in PL/SQL, it is actually a SQL Plus feature (that has been copied in Toad, SQL Developer etc. for compatibility). In SQL Plus, & is used to define a substitution variable, which is replaced with specified replacement text by SQL Plus before the code is sent to the server to be processed.
Is as in PL SQL?
Question: What is the difference between ‘IS’ and ‘AS’ in PL/SQL? Answer: The PL/SQL language evolved such the the “IS” and “AS” operators are equivalent. Functionally the “IS” and “AS” syntax performs identical functions and can be used interchangeably.